Fluid control for fluid-driven motors



y 1946. c. w. MOTT 2,399,756

FLUZ ED QONTROL FOR FLUID-DRIVEN MOTORS Filed D90. 31, 1943 10 Sheets-Sheet 1 May 7, 1946.

c. w. MOTT FLUID CONTROL FOR FLUID-DRIVEN MOTORS l0 Sheets-Sheet 2 Filed Dec. 51, 1943 y 19 6- c. w. MOTT 2,399,756

FLUID CONTROL FOR FLUID-DRIVEN MOTORS Filed Dec. 51, 1943 10 Sheets-Sheet 3 3 jam 4 dazrzzy y 1946. c. 'w. MQTT FLUID CONTROL FOR FLUID-DRIVEN MOTORS Filed Dec. 31, 1943 10 Sheets-Sheet 4 y 1946- c. w. MOTT 2,399,756

FLUID CONTROL FOR FLUID-DRIVEN MOTORS Filed Dec. 51, 194:5 1o Sheets-Sheet 5 10 Sheets-Sheet 6 May 7, 1946. c. w. MOTT FLUID CONTROL FOR FLUID-DRIVEN MQTORS Fild Dec. 31, 1943 y c. w. MOTT 2,399,756

FLUID CONTROL FOR FLUID-DRIVEN MOTORS Filed Dec. 31, 1943 .10 Sheets-Sheet 7 May 7,- 1946.

C, W. MOTT' FLUID CONTROL FOR FLUID-DRIVEN MOTORS Filed Dec. 31, 1945 10 Sheets-Sheet 8 M 2% a Q 7 May 7, 1946. c. w. MOTT FLUID CONTROL FOR FLUID-DRIVEN MOTORS Filed Dec. 31, 1943 10 Sheets-Sheet 9 NVB RE Juerzf):

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Pate ntied May 7,

FLUID coN'raoL roa FLUID-DRIVEN Morons Carl W. Mott, La Grange, Ill., alsignor to International Harvester Company, a corporation of New Jersey Y Application December 31, 1943, Serial No. 516,471

10 Claims. (CI. 60-52) This invention has to do with a system of motor control and operation energized by fluid derived from a constant delivery source. and, while the invention is particularly adapted for use in a power lift upon a motor vehicle and is so illus trated herein upon a tractor, numerous features having utility in other fields will be immediately apparent to those skilled in the art.

More specifically the invention relates to a fluid motor operating and control system generally of the character shown in my applications filed herewith Serial No. 516,470, filed December 31, 1943, for Fluid control apparatus and Serial No. 516,468, filed December 31, 1943, for Pressure regulating fluid control apparatus, wherein fluid for driving the motor is'obt'ained from a constant delivery source by closing a normally open by-pass whereby the source will be caused to deliver fiuid at a high pressure necessary to drive the motor only during motor operation periods.

The pressure regulator is of a type remotely controlled in response to the operation of a control valve to change the pressure of fluid imposed upon a part thereof.

An object of this invention is the provision of an improved arrangement wherein said control valve is operated jointly with an admittance valve which controls communication between the source and motor and wherein these valves are installed in proximity to an operators station for direct access. Since these valves require force to operate, the sensitivenessoi their control is enhanced by avoiding a long or plural-part valve-operating arrangement with the attendant lost motion at Joints and strain within the parts themselves.

A further object is the provision of an organization in which the pressure regulator, the motor, and the control and admittance valves are closely grouped to minimize flow resistance and thus facilitate promptness in action of the pressure regulator and motor in response to valve manipulations. v

Another object is the provision of a channeled and apertured structure upon which the valves, pressure regulator, and motor are mounted to supply the necessary passages of the fluid system in a fashion minimizing the separate connection and use of hoses or pipes. Y

A further object is the provision of a new motor and valve panel arrangement in combination with a reservoir for the fluid employed in the system, the arrangement being one in which the cylinder of the motor has an end rigidly secured to a side wall or the reservoir and in which the walls the reservoir contain channels communicating between the motor cylinder and the valves.

Another object is the provision of a novel arrangement in which the motor cylinder is rigidly secured at an end to a support and in which the piston rod is hollow and contains a pivotal connection for a connecting rod, whereby the connecting rod as well as the piston rod is movable endwise into the cylinder and whereby the over-all length required for the motor and its connection with a rock-shaft to be operated thereby is diminished.

A further object is the provision of a new arrangement of fluid-driven motor, actuating-fluid reservoir, valves and actuating means therefor accessible to an operator and connected with the motor work member by a novel means for automatic operation of the valve means to stop the motor when it has operated to an extent determined by manual manipulation of the valve means.

A further object is the provision of an improved valve mounting plate which serves as a. cover for an opening in the reservoir and which removes the valves therewith to simplify their servicing.

, Still a further object is the provision of a novel removable reservoir panel with a pocket on its inner side for the reception of oil to be .filtered and having a large opening communicating with the reservoir and a filter element covering such opening.

These and other desirable objects inherent in and encompassed by the invention will be bet- 'ter understood by reading the ensuing description with reference to the annexed drawings, wherein: a

Fig. 1 is a side elevational view of a tractor upon which there is mounted a preferred form of the invention;

Fig. 2 is a side elevational view of the midportion of the tractor, taken from the side opposite to that shown in'Fig. l, and illustrating both manual and motor-operated valve control members for the apparatus;

Fig. 3 is a horizontal view looking downwardly into a housing for the fluid-driven motor to illusing the fluid to by-pass the motor at low pressure excepting when the aforesaid admittance and control valves are actuated for causing the motor to perform work;

Fig. 5 is a horizontal sectional view taken through the motor and the actuating-fluid reservoir, taken as indicated by the line 5 in Fig. 4;

Fig. 6 is a view, partly diagrammatic, illustrating the flow of fluid between the various parts of the apparatus to and from the pump both during actuation and quiescent periods of the motor;

Fig. 7 is a front elevaticnal view of the front wall of the reservoir;

Fig. 8 is a front elevational view of a passageforming and motor-supporting plate which is attached to the front face of the reservoir front wall;

Fig. 9 is a fragmentary view showing a portion of the plate of Fig. 8 assembled with the reservoir front wall and the assembly of the pressure regulating unit withthese parts;

Fig. 10 is a sectional view of the pressure regulating unit taken on the line iU-IO of Fig. 9 and illustrating the incorporation into this unit of certain parts and passages formed within the reservoir front wall and in the plate shown in Fig.

Fig. il'is a fragmentary sectional view taken as indicated by the line II in Fig. 10, showing the manner in which the by-pass passage leads from the. pressure regulating unit into a section of the reservoir;

Fig. 12 is an elevational view of the inner side of a valve panel forming one side wall of the reservoir, and also showing in elevation valveoperating mechanism and the association thereof with valve stems to be operated thereby;

Fig. 13 is an elevational view looking forwardly of the tractor and taken on the line it of Fig. 12 to further illustrate the valve-operating mechanism; I

Fig. 14 is a view looking upwardly at the slightly irregular section indicated by the line Il-il of Fig. 12, to illustrate parts of the valveoperating mechanism as well as certain of the valves controlled thereby; and

Fig. 15 is a fragmentary sectional view taken on the line I! of Fig. 12, this view also being taken in an upward direction and showing one of the control valves for determining when the a plate 32 upon the front wall 33 of reservoir 34, for the motor actuating fluid. The return conduit 29 communicates with the interior of the reservoir through a hole 35 in the plate 32, Figs. 6 and 8, an L-shaped channel 38, in the front face of the reservoir wall 33, Figs. 6 and 7, and a hole 31 at the lower end of this channel extending through such wall; thus, fluid returns to the pump from the reservoir through the hole 31, channel 38, hole 35 in the plate 32, and conduit 29, Figs. 4, 3, 6, and l. Fluid passed from the motor through the conduit 28, while leading through the conduit attaching member 3! in Fig. 4, does not discharge into the reservoir but into passages which ultimately are selectively communicative with the ends of the cylinder 38 of a motor M, Figs. 4, 5, 6, and 3. In Fig. 3, sections 39 and 4| of a coupling device 42 are respectively upon the interior and'exterior sides of a wall 43, which forms a portion of a housing H containing the motor M. The parts of this coupling device 42 are secured together by bolts 44 and provide communication between walls 43 and 4B, which are connected at their back ends by bolts" to the plate IQ, and hence indirectly to the reservoir ll. Forward ends of the housing plates 43 and 46 are connected to a bridging member 48, Fig. 3, by bolts 48. This pressure regulating unit of Figs. 9, l0, and 6 T shall be in by-pass condition.

With continued reference to the drawings, the

apparatus embodying this invention is installedon a tractor shown in its entirety in Fig. l. This tractor has rear traction wheels Il front support wheels 2| steered from a steering wheel 22 through a steering shaft 23 in the usual manner. The body 24 of the tractor is formed rigidlywithanengine 2| andatthebackofthebody a driver's seat. II is provided for placing the driver or' operator seated thereon in readily accessible proximity to the steering wheel 22 and to controls for the tractor and for the fluiddriven apparatus forming this invention.

Fluid for-the apparatus is supplied from a pump 21, which is constantly driven from the engine cam shaft by gearing in a housing SI.

eter than the conduit 2|. These delivery and.

return conduits It and 2| lead to a coupling member SL'Flgs. 3 and 4, which is attached to bridging member, asshown in Fig. 1, lies against the back end of the vehicle engine 28 to which it is connected by any standard means. The housing side wall plates 40 and 48 are generally L-shaped with their shorter leg extending vertically and resting upon the tractor body to which they are connected by means of bolts Ii which are screwed into a boss I on such body.

The housing H, in addition to enclosing the motor M, provides support for a rock-shaft comprising oppositely extending portions I and I4. The inner ends of these rock-shaft portions are arranged coaxially and are clamped together within the split huh I! of an arm I! which is bifurcated at its upper end for receiving the forward end of a connecting rod ll, which extends from the motor M. The outer ends of the rock-shaft 53-54 have upwardly extending arms I and I8, and. when the connecting rod 51 is moved axially by the energization of the motor M, force will be transmitted through the arm 58 interi'orly of the housing H. the hub l8 of such arm, and the rock -shaft portions ll and 54 connected together within the hub II and rotatably supported within the housing walls 43 and I for causing rocking of the ex terior arms 58 and BI. The purpose of the apstraps 82 are shown supporting the fuel tank,

and opposite ends of these straps are secured to the housing side walls by bolts '8.

Control or the by-pau condition of the appsratus and of the direction in which fluid pressure is applied to the piston P within the motor I is determined by the manual manipiflstion oi six valves contained within a valve panel 34 forming one side of the actuating fluid reservoir 34. These valves, which are designated CONI, CON2, EXHI, EXH2, ADMI, and ADM2, consist of two groups which are alternatively operated .or opened. The first group CONI ExHLand ADMI are operated concurrently when it is desired to cause the motor piston to be driven rearwardly, whereas the group CON2, ADM2, and EXH2 are operated when it,is desired to drive the motor piston forwardly. Before undertaking to describe these valves and their control mechanism in detail, a preliminary general description ,of their operation with the other parts of the apparatus will be given with reference primarily to Fig. 6.

In Fig. 6 there is shown the pump 21, the motor M, the pressure regulator device PR, the left edge of the plate 32, with which the back end of the motor cylinder 33 is assembled, the front face or the front wall 33 of the fluid reservoir, and the ing of the by-pass valve 31, preventing flow downwardly through the channel 33 and diverting the flow upwardly through channel leg 91. With the manually operated valve CON2, EXH2, and ADM2 opened, as described above, fluid flowing upwardly from the channel leg 31 will continue in its progress through a channel 93 in the reservoir front wall, ports 39 and 14, valve panel channel 13, diagonal channel 99, inwardly (toward 'the interior of the reservoir) past the admittance valve ADM2, channel l3l, outwardly past a check outer or left face of the reservoir wall and valve panel member 34; The wall or panel members 33 and 34 are shown slightly in perspective to expose a left edgeportion 33 of the member 33 and forward edge 33 of the panel 34. This perspective showing of the members 33 and 34 is for suggesting their actual physical association shown in Fig. 5 where these members can be seen disposed at right angles to one another with the inner face of the panel 34 adjacently to its forward edge 33 laying flatly against the left edge portion 35 of the member 33. This places ports 31, 33, 39, and 1| in the edge portion 33 in communicative registry with ports 12, 13, 14, and 13 of passages 13, 11, 13, and 13 in the panel 34.

When it is desired to cause forwardmo'vement of the motor piston P, the manual control of the valves in the panel 34 will be operated for open-, ing the groupconsisting of the valves CON2, EXH2, and ADM2. This opening of the valve CON2, which is-termed a control valve, conditions the pressure-regulating device PR for terminating the by -pass condition, whereby the pump 21 is caused to deliver fluid at high pres sure for introduction into the motor cylinder. The manner in which this affects the pressure regulator will be described in detail hereinafter, but tentatively it will sufiice to say that the escape of fluidfrom the pressure regulator through a passage 3| formed jointly by a groove in the front face of the reservoir .wall 33 and the plate 32 covering the same, thence through a channel 32 in the wall 33, port 31, port 12 in the valve panel 34, channels 13 and 13 inwardly toward the interior of the reservoir past the valve CON2 and valve 0K2, channels I32 and 11 (without flowing through the exhaust valve EXH I which is now closed), ports 13 and 33, channel I33 in the reservoir wall 33, and thence into the back end of the cylinder 33 through a large hole I34 in the the cylinder 33, fluid is allowed to escape from the front end of the cylinder back to the reservoir; through a motor casing channel I33, a

hole I33 in the plate 32, channel I31 in the front wall of the reservoir; ports H and 15, channels 13 and I 33 in the valve panel 34 (without flowing through the check valve CKI), thence upwardly past the now open exhaust valve EXH2,

and outwardly through an exhaust channel I39 directly into the reservoir.

When it is desired to stop the motor, the valves CON2, ADM2, and EXHZ will beclosed, and the valve group CON I, EXHI, and ADMI will'be left closed. Fluid can then no longer escape through the control passage 3| and either of the control valves CON2 or CON l, causing the building up of pressure in a section of the pressure regulator PR, in a manner presently to be described, for

through a passage 33 into the reservoir 34, will condition the pressure regulator for terminating -by-pass; see Fig. 15 showing the valve CONI and its associated discharge passage 33 which are arranged similarly to va1ve CON2 and passage 33.

again establishing the by-pass condition of the apparatus, so the continuous running pump can cause circulation at low pressure through the conduit indicated by the heavy arrows.

When it is desired to cause movement of the motor piston from front to back, the valve set CON2, ADM2, EXH2, will be left closed and the valve set CONI, EXHI, and ADMI will be opened. The opening of the control valveCON I causes the discharge of fluid from the control passage 3| in the same manner that the control valve CON2 was so effective as described above, this passage taking place from the control channel passage 13 inwardly toward the reservoir, past the Prior to this termination of the by-pass condition, fluid flowed in a circuit indicated by the chains of heavier arrows in Fig. 6. By tracing the paths of theseheavy arrows it can be seen 1 groove in the front face of the reservoir wall 33 valve CONI (see Fig. 15), for discharge directly into the reservoir through a passage 33a. This stops the fiow of fluid through the by-pass valve 31 and causes it to flow upwardly in the channel leg 31, through channel 93, ports 39 and 14, and

flow occurs inwardly past this valve into a chanand covered by the plate 32; thence, downwardly nel l I l, past the check valve CKI, into the channel 19. Channel 13 communicates with channel I33, but, since the exhaust valve EXI-I2 is'now closed, flow cannot occur through the channel I33 and past the valve EXH2. Flow does occur in the channel 19 in the direction opposite to that indicated by the arrows, the flow proceeding through ports 13 and 1|, channel I31, hole I33 the exhaust valve EXHI for discharge directly.

into the reservoir through a channel H2.

Structural details of the pressure regulating device are shown in Figures 1, 8, 9, and 10. While a projecting portion of this device is formed by a thick plate or block 9| and a cap II3 therefor (Figures 4, 6, and 10), the reservoir wall 33 and the plate 32 also form parts of the pressure regulating device. This is apparent from Figure 10. A springchamber II4 for the by-pass valve 81 of the pressure-regulating device is formed in the reservoir wall 33. This by-pass valve includes a ball I I5 urged onto a seat I I6 therefor by a spring I I1 in the chamber I I4 and a ball follower member I I8, which is disposed between the spring and the ball. The seat H6 is formed by enlarging the end of the hole 88 through the plate 32. This hole 88 comprises a section of the passage through which fluid is by-passed (when the ball H5 is unseated) to the reservoir, the other sections of the passage including the channel 89in the back face of the block 9|, the hole 92 in the plate 32, and'the L-shaped channel 93 in the reservoir wall 33; see Figures 10 and 11 jointly. In Figure 11, one leg of the L-shaped channel 93 is shown communicating through a hole I23, in a reentrant flange I24 of a removable wall I25 of the reservoir 34. Thus, the discharge from the pressure regulator during by-pass will be into a section I26 of the reservoir which is separated from the main section by a filter screen I21. Intake for the pump is through the channel port 31 (Figs. 6 and 7), which communicates with the main part of the reservoir, so that fluid delivered to the' pump will flrst be drawn through the filter screen Means for unseating the by-pass valve ball II5 for establishing the by-pass condition of the pressure regulator unit PR includes a piston I28 shiftable axially in a cylindrical recess I29 in the block 9|. This piston member has stems HI and I32 that are coaxial therewith respectively abuttin the ball I I5 and projecting in journaled piloting relation within a hole I33 extending through the block from the closed end of the recess I29. When fluid pressure is appliedto the forward end of the piston I25 (the right-most end in Fi 10), the ball II5 will be unseated for causing by-pass. When the fluid pressure is relieved from the forward end of the piston, the spring H1 is operable to seat the ball and preclude by-pass. Fluid pressure is appliable to the forward end of the piston I29 through a pressureapplying channel I34 which includes a recess I35 in the plate 32, a hole I36 having a limited flow capacity leading from said recess, a hole I31 in the block 9|, a channel I33 in the back face of the cap Ill, and a hole I39 formed in the bottom of the recess I29 in parallelism with the bearing hole I33. A filter consisting of a sleeve I having a fllter screen I42 over an end thereof is disposable in the recess I35 to assure that no of the piston I28 will sufflciently exceed the pressure of the spring H1 and of fluid pressing against the by-pass ball II5 to hold the ball unseated. Upon the diversion of fluid from the pressure-applying channel I34, however, at a rate greater than the fluid can be replaced through the restricting hole I36, the pressure upon the front end of the piston will be so diminished that the pressure of fluid in the channel leg 35, augmented by the force of the spring II1, will prevail in seating the ball, and, after the ball is seated, the force of the spring II1 will be stronger than the reactive force of the fluid upon the forward end of the piston I28 while there is diversion of such fluid.

Diversion of fluid from the pressure-applying passage I34 is under control of either or the control valves CONI and CON2, Figs. 6 and 12. A control passage leading to these valves from the pressure-applying passage I34 includes a channel I43, Figs. 9 and 10, a hole I44 through the block 9i, Fig. 9, a hole I45 in the plate 32, Figs. 6 and 8, channel 3i, Figs. 6 and 7, channel 82, ports 61 and 12, Figs. 6 and 7, and channel 16 in the control panel 64, Fig. 6. If the control valveCONI should be opened, fluid can escape through the just-traced control channel past said control valve for discharge directly into the reservoir through the passage 93', or, should the valve CON2 be opened, the fluid can escape past this valve and through the channel 83 into the reservoir.

It is possible to control the speed at which the .motor work member or piston is moved by throttling or adjusting the degree to which the atlmittance valves ADMI or ADM2 are opened With either of these admittance valves operating in a throttling position, the delivery of the pump will exceed the rate at which fluid can be forced into the motor cylinder and thereby create an undesirably high pressure condition within the system, unless some means is made to prevent this. In the present apparatus, this condition is met by a pressure relief valve I46, Fig. 10, which includes a hollow open-ended plunger I41 slidable within a hole I49 through the plate 32. The hole I49 as well as the interior of the plunger communicates with a lower portion 01' the fluid delivery channel leg 38. A plurality of holes I49 and I50 are formed in the side wall of the plunger I41 adjacently to its front end which is closed, so that, should the plunger be moved axially forwardly, one or more or these holes, depending upon the extent of movement, would communicate with a pressure relief passage I5I which includes a channel I52 in the hack face of the block 9| and holes I53 and I54, respectively, in the plate 32 and the reservoir front wall. A spring I55 seated within a shallow recess I56 in the pressure regulator cap II3 bears rearwardly within a spring cup I51, which is slldable within a cylindrical holelil in the block. 9| to press this cup against the front end of the plunger I41 and to thereby maintain the plunger in the non-fluidpassing condition except during periods of abnormally high pressure fluid in the channel 36. Upon sufllciently high pressure being attained in the channel 84, the plunger I41 will be pressed forwardly incident to moving the spring cup I51 small particles of foreign material shall lodge in the restricted passage or hole I36.

So long as no fluid can escape from the pressure-applying channel I34, the pressure of fluid imposed through this channel onto the front end forwardly while compressing the spring I55, to permit the escape of excessively high pressure fluid.

Passing now to the detaik of the control valve panel 54, the valves thereon and the valve-wontrolling linkage, reference should. he had to F12 a table by adjustable tappet members Ill,

12 to 15. The valve-supporting panel 64 has a plate Ill secured to its inner face and a cap plate Ill secured to the inner face of the plate Ill. Bolts Ill extend through both of the plates Ill and Ill into threaded recesses in the panel 64 for securing these parts in assembly. Bolt holes Ill about the edge of the'panel ll are for the reception of bolts Ill, Fig. 2,. which secure this panel in place upon its side of the motor-propelling fluid'reservoir.

Each of the six manually-operated valves is operated through a valve-stem Ill slidable in a bearing opening Ill therefor in the cap or cover plate Ill. The inner ends of these valve stems (the upper ends as viewed in Figure 14) are abutwhich are held in their adjusted position by lock-nuts These threaded tappet members Ill are carried within arms projecting laterally from a rockabl member III pivoted upon a rod I12, Fig. 14, having its ends mounted within bosses I'll, respectively, at the upper and lower ends of the cover plate Ill. Said arms projecting laterally from the rockable member and two of these arms projecting backwardly to the left, as viewed in Fig. 12, are provided with bearings I'll at their ends for slidably and rotatably containing 'a rod I'll. Bodily movement of this rod I'll inwardly or outwardly (of the reservoir), toward and from the observer in Fig. 12, or up and down in Fig. 14, will cause the member III to rock about the bearing rod I'll therefor, whereby rocking of the member III in one direction will cause the valve stems upon one side of the member "I to be depressed for opening their group associated valves while leaving closed the group of valves associated with the other valve stems. Rocking of the member III in the opposite direction will reverse the operation of the groups of valves. In Fig. '14 the rockable-member I'll is shown in the neutral positionin which neither set of valves is open.

Before explaining the-mechanism for controlling rocking of the valve controlmember IlI, a brief description will be given of the valves on the control panel ll and the passages interconnecting certain of them. For this part of the description, reference should be had to Figs. 12, 14, and 15. v

In Fig. 14, the admission valve ADMI and the exhaust valve EXHI each includeavalve chamber CH. Valves ADMI and EXH: include similar chambers, and the valves ADMI, ADMI,

III are designated I'll,

wardly between the plungers Ill and the interior of the hollow primary valve members Ill, past the seats Ill, and outwardly of the primary valve members through holes Ill in their upper ends. This permits the escape of fluid from the valve chamber and an introduction of fluid into the space above the valve chamber, reducing the difference in fluid pressure upon two sides of the primary valve member, so it can be opened more easily upon the subsequent abutment therewith of an enlargement I92 upon the associated valve stem Ill. Thus, in the operation of any of the valves as ADMI and EXH2, there is an initial opening stage in which the secondary valve members Ill are opened to cause partial equalization of pressure by the displacement of a small frontal area against the pressure of fluid, and a second stage in which the larger frontal area of the primary valve member is displaced against the diminished differential pressure bias to incur a large volume of flow. Y

The two check valves CKI and CKI are in chambers CHKI and CHKI, each including communicating recesses respectively in the plate Ill and in the panel proper ll. Each check valve includes a ball member Ill normally held against a seat Ill by a follower I95 and a spring Ill pressing upwardly thereon. A spring guide I91, resting upon the bottom of the chamber CHK, is also provided for these valves. Short bores Ill diagonally intersecting the passages Ill just above the valve seats Ill, allow the fluid to escape upwardly from the unseated balls Ill, while the stem enlargements ll! of the members Ill in restricting relation with the passages Ill. 1 v

In the case of the control valves CONI and CONl, they are also similarly constructed, and their construction is similar to that of the check valve. Referring to Fig. 15, the check valve CONI can be seen to include a ball Ill urged aaginst seat"! by a ball follower m, which is urged EXHI, and EXH! are themselves identical in construction. Xalves 'of this character are fully described andf'claimed in my copending appiication. Serial No. 500,502. filed August so, 1943.

Each of the valve chambers CH includes a recess I'll in the plate I" and a recess III in the panel Proper ll. Each recess Ill hasan outlet opening III at its upper end'and' a' valve seat Ill about such opening IlI.

A primary valve-member Ill is cylindrical for slidable axial adjustment in the recess Ill and has axial nuid conducting channels Ill in its outer periphery'./ Secondary valve membersof the valves as m: and ADMI'are in the form of balls I ll pressable against a secondary valve. seat Ill within the upper ends of the primary valvemembers Ill by spring-pressed plungers I" acted, upon by'springs Ill upon their'lower ends. Guides Ill for the-"springs I are disposed within the valve chamber recesses Ill. The valve stems Ill are movable downwardly from the neutral positions opened, the fluid reaching-the bottom or outer.

e shown n l-l 1'01 d it gonal channel in panel ll. Thus, when either or the through the channel 'll, in dotted outline, and outwardly of the'panel spring ll! stabilized by a spring guide member Ill rested upon the bottom of a chamber CHC for the valve.. When the ball is unseated downwardly by the associated valve stem Ill, fluid can escape upwardly over the valve seat Ill and through a channel 2 into the exhaust port as llassociated with suchvalve.

"Referring now to Figs. 12 and 14, the fluid in the channel ll can be seen to communicate with *the lower end of the'valve chamber of the valve ADMI and to also communicate with the lower end or the valve chamber for the valve,ADM2 through the diagonal channel ll formed in the inner face (facing upwardly upwardly by a valves ADMI or ADM! is opened, fluid under pressure can escape upwardly through the valve chamber I In the case of the valve the fluid escaping upwardly therepast flows into the channel III formed in the underface (as viewed in Fig. 14). of the plate Ill and thence into the CKI by displacing the ball Ill downwardly. From the check valve chamber the fluid is directed as shown in Figure 12 through the port 15.

When the fluid admission valve arms a of the valve chamber CH thereof through the rest on the upper ends in F18. 14) of the chamber CI-IKI of the check valve the inner face of the panel 64 will flow inwardly (upwardly as the panel 64 and the plates I6I and I62 thereon are observed in Fig. 14) through the chamber and outwardly into the channel I shown in dotted outline in Fig. 12 and which is formed in the outer face of the plate I62 similarly to the formation of the channel III shown in Fig. 14. From the channel I 0|, the fluid then forces its way outwardly (downwardly as the parts are disposed in Fig. 14) past the check valve 0K2 and into the channel I02 also shown in dotted lines in Fig. 12, and formed in the inner face of the panel 64 (upper face of such panel as theparts are disclosed in Fig. 14) similarly to the channel I08, Fig. 14, for direct communication with the outer end of the chamber of the exhaust valve EXHI. This outer end of the chamber of the exhaust valve EXHI communicates with the port 13 through the buried channel 11 in the panel 64, so that fluid entering the outer end of the chamber of the valve EXHI from the channel I02 is dischargeable through the port 13 without the exhaust valve EXHI being opened. However, when the exhaust valve EXHI is open, fluid exhausted from the motor and directed into the port 13 is flowable through the channel 11 and inwardly of the reservoir through the chamber of the valve EXHI and outwardly into the reservoir through the relatively large discharge channel II 2 similarly to the channel I03 in Fig. 14. A comparable arrangement is shown in Fig. 14 for the exhaust valve EXH2 where the channel I08, corresponding to the just-mentioned channel I02, leads from the associated check-valve member CHKI into the outer part of the chamber of the exhaust valve EXHZ. However, since the exhaust valve EXHZ is never open while the admittance valve ADMI is open, the channel I08 does not serve to dellver to and past the exhaust valve EXHZ any fluid which i being admitted into the check-valve member CHKI past the ball I 93. But the passage I08 does serve to exhaust fluid received from the motor through the port 15, Fig. 12, channel I9, valve chamber CHKI, passage I08, and into the reservoir 34 I09 when the valve EXH2 is opened.

Fluid from the pressure-applying passage I34, Fig. 10, of the pressure regulator is introduced into the outer end of the control valve chamber CHCI, Fig. 15, through the port 12 and the passage 16, and the cross-channel 16* in the inner face of the panel 64 causes like impression of fluid into the outer end of the control valve chamber (II-1C2, Fig. 12. Therefore, when the valve CONI is opened, fluid can escap from applying passage I34, channels I43, I, 8I (Figs. 9, 10, and 6), channel 82, and port 61 (Fig. 6) and through the port 12 (Figs. 6 and 15) and outwardly into the reservoir 34 through the channel 83 and when the valve CON2 is opened in lieu of the valve CONI, the fluid entering the port 12 can escape through the channel 16, the cross-channel 16 in said valve CON2 and the channel 83, Figs. 6 and 12.

The mechanism for operating the r'ockable control member I1I, illustrated in Figs. 2, 12, 13, and 14 like the above described valves, is carried and is removed from the respanel when the lattenis detached as for servicing such mechanism or valves. Valve-operating mechanism of this general charactor is shown and claimed in my copending application Serial No. 466,463, filed November 21, 1942. The present valve-operating mechanism includes a pair of cam means counterparts rethrough the port said pressure-.

which is arranged and 13) upon spectively designated 2 and 2I2. Counterpart 2 has a base portion 2 I3 which is freely slidable lengthwise of a reaction rod 2. This rod, to conserve space, is disposed within an elongated recess 2 I5 in the inner face of the panel 64 where such rod is secured to bosses 2 I 6 by any standard fastening means 2I1. A pair of spaced-ears 2l8 mutually carry a pin 2I3, which rides within a slot 22I of the counterpart 2I2. This slot 22I includes a diagonal mid-portion 222 and end portions 223 and 224 which extend lengthwise of the rods I16 and 2I4. Said counterpart 2I2 is rigidly secured to the laterally displaceable rod I16 at its ends by machine screws 220. The rod I18, it will be recalled, is pivotally mounted in the bearings I65 and I15 upon the rockable member HI and is also freely slidable endwise in these hearings. Relative movement of the counterpart elements 2 and 2I2 lengthwise of the rods 2 and I16, while the pin 2|! is in the diagonal slot portion 222, will exert a force between the fixed reaction rod and the laterally displaceable rod I16 for displacing the latter either to the right or to the left, as viewed in Fig. 13, depending on the direction of relative movement, and this lateral displacement of the rod I16 will, of course, cause the rockable control member I1I (Fig. 14) to be pivoted from its neutral position for selectively opening the valve sets CONI-EXHI-- ADMI and CON2--ADM2EXH2.

In the present arrangement, the slidable follower member 2II is manually controlled or moved by means of a manually operated lever 225; see Figs. 1, 2, 3, 4, and 13. In Figs. 2, 3, and 4 lever 225 is shown in association with a quadrant 226 over which it is adjustable. A stop 221, which is selectively settable in registry with apertures 228 on the quadrant 226, can serve as a guide to enable the operator to move the lever 225 to a preselected position. The lowerend of the lever 225 is fixed upon the outer end of a shaft 223 which is rotatable in the panel 64. An inner portion of the shaft 225 has an arm 206 fixed thereto, and a projecting end of said arm 206 is pivotally connected to the upper end of a link 201 which has its lower end pivotally connected at 208 with the slidable cam means counterpart 2.

Motor driven means is provided for moving the cam means counterpart 2I2. This motor-driven means comprises an arm 209 (Figs. 2, 3, 4, 5, the outer side of the valve panel. The upper end of the arm 209 is pivotally connected with the back end of a rod 23I, Of which the front end is pivotally connected with the upper end of an arm 232 (Figs. 2 and 3) which is fixed to the rockable shaft 53-54. Referring now to Figs. 12 and 13, the inner end of a shaft 233 to which the external arm 209 is non-rotatably connecte rigidly carries a knuckle member 234 upon its inner end. This knuckle member has a bearing pin 235 Journaled therein for rotation about an axis normal to the axis of said shaft 236 has-a bifurcated end secured to opposite ends of the pin 235, whereby said arm is free to pivot about an axis normal to the shaft 233 but is constrained for pivotal movement with the shaft 233 aboutits axis. The projected end 231 which has its upper end pivotally connected at 238 to the cam counterpart 2I2. By the train of arms, shafts, and links just described, the cam manual manipulation of the arm 22!, Figs. 2, 3, and 13, for sliding the cam means element 2| I, say in a downwardly direction for displacing cam means element 2|2, to the right as viewed in Fig.

direction, said train will incur counter-clockwise rotation of the shaft 223 as viewed in Fig. 12 and downward movement of the link 221 and said cam means element 2|2 for reestabllshing the diagonal slot portion 2|2 in its neutral centered relation with respect to the pin as illustrated in Fig. 13. Thus following a movement of the manual control lever 225 in a rearward direction over its quadrant 226, a selected distance for causin a corresponding displacement of the cam means pin 2 I 9 of Figure 13, the consequent ensuing operation of the motor M will be correlated in the amount of its operation by the linkage which reestablishes the neutral positionof the valve means element 2|2v with the element 2| Operation of the manual control lever 225 in a forward direction will cause upward movement of the cam means element 2 in Fig. 13 for imparting force to the element 2|2 for pivoting the rockable member ill in Fig. 14 counter-clockwise for opening the other set of valves COM- ADM2--EXH2 and thereby causing forward movement of the motor work member or piston; and this forward movement of the motor piston is effective through the arm 222 Of Fig. 3, link 22|, arm 209 of Figs. 2, 3, and,13, shaft 232, arm 226, and link 221 for moving the cam means element 2|2 upwardly for reestablishing the cam slot 222 in the neutral relation with respect to the .pin 2|! upon the motor completing an operation correlated in amount with the movement of the manual control lever. Bald reestablishment of the cam slot 222 in the neutral relation illusvtrated in Fig.- 13 with respect to the pin 2|! will,

of course, return the rockable member III to its neutral position of Fig. 14, causing all valves operated thereby to be closed. Movement of thecam means element 2 in downward direction by the manual manipulation of the lever 22! to the lower end of the diagonal slot portion 222 will be effective for rotating the 'rockable control element I'll in Fig. 14 sufficiently clockwise for fully opening the valve. set CON|EXH|ADM|. However, should the operator desire to-cause the motor piston to be advanced a considerable distance within its range of movement, he ma immediately move the manual lever 22! to the point upon the quadrant 224 of Fig. 2 corresponding to such desired distance pursuant to advancing-the pin!" downwardly within the cam slot portion 223 without imparting further pivotal movement to the rockable member III in Fig, 14. The valves COM,

the tractor just ahead of a box 24| for containing a battery. This box is'supported on brackets 242 adjacently to and forwardly of a gear shifting lever 243. The box 24| supports a panel 244 for instruments 245 and 246 which are visible to an operator in the seat 26. A small casing 241 on the right side of the reservoir 24 encloses the connections of a throttle lever 244 with a linkage (not shown) extending to parts of the engine 25. The reservoir 34 also supports a bearing and stabilizer bracket 2" for the steering shaft 23. This expedient and compact arrangement of the described parts makes it necessary for the reservoir 34, the motor M, and the housing H (supporting the rock-shaft 53-54 and enclosing the motor) to be confined within the limited space between. the battery box 2 and the engine 25.

The manner in which these parts are disposed in this comparatively short space is contributed to by the mode of attaching the' motor connected rod 51 of Fig. 5 with the piston .P; that is, the particular connection used between the connecting rod 51 and the motor piston makes it possible to shorten the over-all required length of the motor and the connecting rod while employinga motor with a sufiiciently long actuating stroke for operating the rock-shaft "-54 without employing undesirably high pressure for the-motor actuating fluid. Said motor piston P includes a' piston rod 249 having a cylindrical head "I containing a slot 252 in its left-end as viewed in Fig. 5. Said head 25| also contains a diametric hole for a pin 253 for retaining a cylindrical crossml, and ADM I will simply remain open durated in the opposite direction for moving the pin 2|! upwardly into the slot portion 224', the only difference being that the motor piston is moved forwardly, instead of rearwardly.

In Fig. 1 the reservoir which carries the control panelflcanbeseentooccupyapositionon l head member 254 onsaid p st n d-h d- T tubular or cylindrical cross-head member 254 has a sealing fit upon the piston rod-head and has a sliding sealing fit within a holeor opening 2 in the front end wall of the motor cylinder. A flattened back end portion 256 of the connecting rod 51 is inserted into the slot 252 where it is pivotally connected with the piston and to the pistonrod head by a pin 251. v

Having thus described the preferred form of the invention with the view of thoroughly illusv trating the same, I claim:

1. In an energization control system for a hydraulically driven motor having a work member moved responsively to energization of the motor by the delivery thereto of fluidobtained from a reservoir; the combination of a detachable side wall panel for said reservoir; valve means on said panel, said valve means being manipulatable from and to a neutral setting to respectively cause .and terminate such delivery of fluid to the motor; and valve operating means comprising respectively manually adjusted and motor-adjusted counterparts on the inner side of said panel, the adjustment of either counterpart being effective complementally with the other, when adjusted, to manipulate the valve means, manual and motor-operated control shafts respectively for the manual and motor-adjusted counterparts and journalled in said panel to present inner shaft portions inwardly of the panel and outer shaft J portions outwardly of the panel, operating con-- necting means between the inner shaft portions and their associated counterparts for adjusting the same when the shaftsare rotated, a manually operated control member connected with the out--' er portion of the manual control shaft and-mov-- 1 able for effecting rotation of the same in the manipulation of the valve means from neutral, and motor-driven means connected between the motor work member and the outer portion of the motor-operated control shaftv for notating i said shaft in the direction and at the rate to reestablish the neutral setting of the valve means upon movement of said work member an amount correlated with the amount of movement of said manually operated control member.

2. In an auxiliary power supplying arrangement for a tractor having a body on which there is an upwardly projecting engine and an operator's station on and spaced axially of said body from said engine; the combination of a hydraulically driven motor upon said body in the space between the engine and operator's station, said motor having a work member which is moved when propelling fluid is delivered to said motor, a pump driven from said engine to deliver propelling fluid to the motor, a reservoir from which such fluid is withdrawn by the pump and for the reception of fluid discharged from the motor, said reservoir being mounted on said body in the said space and between the motor and the operators station, valve means in the reservoir, said valve means being in control of the fluid delivery to the motor and manipulatable from and to a neutral setting to cause and terminate such fluid delivery, valve operating counterparts in the reservoir, one of said counterparts being manually adjustable'and the other motor adjustable and either counterpart being operable complementally with the other, when adjusted, to manipulate the valve means, manually operated and motor-operated rotatable control shafts extending into the reservoir respectively intooperatlve connection with the manually adjustable and motor adjustable counterparts, a manually operated control member connected with the manual control shaft accessibly to an operator at said station and manually movable for effecting rotation of said shaft in the manipulation of the valve means from neutral, and motor-driven means connected between the motor work member and the motoroperated control shaft for rotating said shaft in the direction and at the rate to reestablish the neutral setting of the valve means upon movement of said work member an amount correlated with the amount of movement of said manually operated control member.

3. In an auxiliary power supplying arrangement for a tractor having a body on which there is an upwardly projecting engine and an operators station on and spaced axially of said body from the engine; the combination of a hydraulically driven motor upon said body in the space,

between the engine and operators station, said motor including a work member which is moved when propelling fluid is delivered to said motor, a pump driven from the engine. to deliver propelling fluid to the motor, a reservoir from which such fluid-is withdrawn by the pump for delivery parts, said parts being complementally operable to manipulate the valve means by the rotation of either of said shafts, a-control handle on an outer portion of one of said shafts accessibly to an operator at said station for the rotation of such shaft to effect manipulation of the valve means from the neutral setting to cause movement of the motor work member, and means connecting said work member with an outer portion of the other shaft to rotate the same in the direction and in an amount to manipulate the valve means into its neutral setting upon the work member moving a distance predeterminedly correlated with that which said handle has been moved.

4. In an auxiliary power supplying arrangement for a tractor having a body on which there is an upwardly projecting engine and an operators station on and spaced axially of said body from the engine; the combination of a reservoir for motor-propelling fluid in the space between v the engine and operator's station and within conto the motor, means for mounting the reservoir on said body in said space and between the motor and the operator's station, said reservoir having a wall opening, a panel detachably secured to the reservoir in closing relation with said opening, valve means mounted on the inner side of said panel for withdrawal thereby through said opening when the panel is detached, said valve means being in control of the fluid delivery to the motor and manipulatable from and to a neutral setting to cause and terminate such fluid delivery, and' valve operating means including valve manipulating parts also mounted onthe inner side of said panel for. disassembly therewith from the reservoir, control shafts on and extending rotatively throughsaid panel into respective operating connection with said valve manipulating venient reach of the hands of an operator at such station, a hydraulically driven motor within said space between the reservoir and the engine and including a cylinder mounted on a wall of the reservoir and projecting endwise toward said engine, the motor also including a piston moved axially in the cylinder when propelling fluid is delivered to said motor, a pump driven from the engine to deliver propelling fluid to the motor, conduit means for circulation of the fluid between the reservoir, pump and motor and including ducts in said wall 01 the reservoir, said reservoir having a wall opening, a panel detachably assembled with the reservoir in closing relation with said opening, said panel having ducts also forming part of said conduit means and disposed in complemental communication with said wall ducts when assembled with the reservoir,

valve means mounted on the. inner side of said panel for withdrawal thereby through said opening when the panel is disassembled, said valve means controlling the flow of fluid through the panel ducts and being thereby operable when manipulated from and to a neutral setting to cause and terminate fluid delivery to the motor, and valve operating means including valve manipulating parts also mounted on the inner side of said panel for disassembly therewith from the reservoir, control shafts on and extending rotatively through said panel into respective operating connection with said valve-manipulating parts, said parts being complementally operable to manipulate the valve means by the rotation of either of said shafts, a control handle onan outer portion of one of said shafts accessibly to an operator at said station for the rotation of such shaft to effect manipulation of the valve means from the neutral setting to cause. movement of the mo tor piston, and means connecting said piston with an outer portion of the other shaft to rotate the same in the direction and in an amount to manipulate the valve means into its neutral settinx upon the piston moving a distance predeterminediy correlated with the distance of handle movement.

5. In an energization control system for a motor having a work member which is moved when the motor is energized; the combination of a control rail laterally displaceable from and to a neutral position to respectively cause energization and deenergization of said motor; a reaction rail disposed in spaced parallelism with the control tions extending parallel with said rails, the fol-- lower element being disposed in said slot to cause the elements to. exert a force between said rails for laterally displacing the control rail incident to relative movement of said elements axially thereof while the follower element is in the di sonal slot portion; means for imparting such axial movement to one of said elements in selective amounts to displace the control rail from its neutral position: and means for moving the other element for restoring the control rail to its neutra1 position, comprising a shaft mounted for pivoting about an axis generally parallel with and spaced from a plane common tosaid rails. an arm pivoted to said shaft about an axis normal thereto, means connecting said arm with the other of said elements for imparting said axial movement thereto when said arm is rotated with said shaft,

assay but constrained to rotate with said shaft and means connecting said shaft with the motor work member'to rotate said shaft and arm in the di- 1 rection to relatively move said elements for restoring the neutral position of the control rail upon the work member moving a distance correlated with the selected movements of the one element.

6. In an energization control system for a hydraulically driven motor having a work member which is moved when the motor is energized by the delivery thereto of fluidobtained from a reservoir; the combination of a detachable side wall panel forsaid reservoir; valve means on said panel to control the delivery of said fluid to the motor and hence the energization; a valve control rail spaced inwardly-from the inner side of said panel and displaceable laterally from and to a neutral position to set the valve means for respectively causing energization and deenergization of the motor; a reaction rail disposed on the inner side of said panel in spaced parallelism with the control rail; cam means comprising a cam element and a cam follower element respectively connected with said rails for adjustment axially thereof, the cam element having a slot with a portion directed diagonally of the rails and an end portion extending lengthwise of the rails, the follower element having a portion in said slot to cause the elements to exert a force between said rails for displacing the control rail incident to relative movement of said elements axially thereof while the follower element portion is in the diagonal slot portion; means for imparting such axial movement to one of said elements in selective amounts to displace the control rail from its neutral position; and means formoving the other element for restoring the control rail to its neutral position, comprising a rotatable shaft extending inwardly through said panel to dispose inner and outer portions upon inner and outer sides of the panel, means connecting the inner shaft portion with the other of said elements for imparting the axial movement thereto when the shaft is rotated, and means for connecting the outer portion of said shaft with the motor work memher to rotate said sh'aft in the direction to move said other element for establishing the relative position of said elements that restore the neutral position of the control rail upon the work member moving a'distance correlated with the selected movements of the one element.

which is moved when the motor is energized by a manually rotatable control shaft iournaled in said panel; means connecting one of the counterparts with said shaft so that when it is rotated the energizing relative movement of said counterparts will incur adjustment of the valve means from the neutral setting to energize the motor a motor-driven control shaft Journaled in said panel; means connecting the motor work member wit h said motor-driven shaft to rotate the same coordinatelywith the movement of said work member during such motor energization; and means connecting the motor-driven shaft with the other of said counterparts for movingthe same to establish the neutral setting of the valve means upon movement of the work member an amount correlated with the rotation of the manually rotatablecontrol shaft.

8. In an energization control system for a hydraulically. driven motor having a work member which is moved when the motor is energized by the delivery of propelling fluid thereto; a circu-- lation system through which such fluid is deliverreservoir having a-wall opening and containing ducts included in said circulation system; a valve panel detachably assembled with the reservoir in closing relation with said wall opening, said panel having ducts disposed in communicative registry with the reservoir wall ducts for inclusion in said circulation system when the panel is assembled with the reservoir; valve means on said panel in control of fluid through said ducts and hence to the motor, said-valve means being adjustable from and to a neutral setting to respectively cause and terminate the delivery of fluid to the motor; valve adjusting mechanism on said panel including counterparts each reactive, against the other when moved relatively thereto to effect adjustment of said valve means; a manually rotatable control shaft journalled in said panel; means connecting one of the counterparts with said shaft '80 that when it is rotated the the same to establish the neutral setting of the valve means upon movement of the work memher an amount correlated with the rotation of the manually rotatable control shaft.

9. The combination set forth in claim 8, wherein said motor comprises a casing having duets conductive of said fluid. and wherein said motor is secured to the reservoir with said motor ducts in communicative registry with certain of the reservoir ducts for inclusion therewith in said circulation system. I

- 10,. In a hydraulic motor control system comprising a' motor-propelling-fluid reservoir having a wall opening, an issuing port from which such fluid Isissuable under pressure and motor ports I I alternately respectively receivable of and exhaustive oi fluid for delivery to and exhausted from the motor for causing its operation in respectively opposite directions; the combination of a valve panel detachably assembled with the reservoir in closing relation with said opening, said panel having a duct system in communicative registry with said ports while the panel is 7 so assembled; valve means disposed in said duct system and selectively .setta ble from a neutral condition wherein the duct system is rendered non-communicative between said ports into alternative non-neutral conditions in which the duct system establishes communication between the issuing port and a respective one of the motor ports while establishing communication between the other motor port and the reservoir; and means for setting said valve means comprising a member rockable about an axis in opposite directions from a neutral position to set the valve means in respective of its non-neutral conditions, a reaction rail on the inner side of said panel in parallelism with the rockable member axis, cam means comprising a cam element and a cam follower element respectively connected with the rockable member and with said rail ior independent adjustment axially of said rail, the cam element having a slot with a portion directed diagonally of said rail and e portions extending lengthwiseoi said rail, the follower element having a portion in said slot to exert a force between said rail and the rockable member for rocking the same incident to relative movement between the elements axially oi the rail while said follower portion is in the diagonal slot portion, a shaft extending through and journalled in said panel, an arm constrained ior rotation with said shaft and a link pivotally connected with said arm and with the rail-connected cam means element for adjustment thereoi when the shaft is pivoted, a second shait extending through and journalled in said panel, a second arm pivoted to such shaft for movement about an axis normal thereto but constrained to rotate with such shaft, and a link pivotally connected with the second arm and with the rockable-member-connected cam means element i'or adjustment there- CARL W. MOTT. 

